VTT says that it conducted the study because many Finnish people frequently claimed that fuel consumption is significantly higher with E10 than with E5 thanks to ethanol's lower octane rating.

The octane number is most relevant if you have ... have reported a drop in their miles per gallon with the new regular E10 petrol. This is because ethanol has a lower 'heating value': for the ...

The move brings Northern Ireland into line with the rest of the UK. E10 petrol was introduced in Great Britain in September 2021. It contains up to 10% ethanol, a renewable ingredient the ...